1 - when I plug in two 2.5" usb 3.0 external HDD to two usb 3.0 ports (blue) in my laptop, around less then 1 min later , the power supply for the 2 ext Hdd is turn off => cannot transfer the files between 2 ext hdd

2 - when I plug in the two 2.5" ext 3.0 HDD, one to 3.0 port and one to 2.0 port on my laptop, nothing happen, transfer the files between them smoothly (~28MB/s)

3 - when I plug in one 2.5" ext 3.0 hdd to 3.0 port on my laptop, nothing happen, transfering the files between laptop and ext hdd is smoothly (~80MB/s)